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Quantum geometry and gravitational entropy

Description: Most quantum states have wavefunctions that are widely spread over the accessible Hilbert space and hence do not have a good description in terms of a single classical geometry. In order to understand when geometric descriptions are possible, we exploit the AdS/CFT correspondence in the half-BPS sector of asymptotically AdS_5 x S5 universes. In this sector we devise a"coarse-grained metric operator" whose eigenstates are well described by a single spacetime topology and geometry. We show that such half-BPS universes have a non-vanishing entropy if and only if the metric is singular, and that the entropy arises from coarse-graining the geometry. Finally, we use our entropy formula to find the most entropic spacetimes with fixed asymptotic moments beyond the global charges.
Date: May 29, 2007
Creator: Simon, Joan; Balasubramanian, Vijay; Czech, Bart Iomiej; Larjo, Klaus; Marolf, Donald & Simon, Joan
Partner: UNT Libraries Government Documents Department
open access

Target Accuracy Assessment for an ADS Design

Description: Nuclear data uncertainties and their impact on a very wide range of reactor systems, including their associated fuel cycles, have to be assessed in order to consolidate preliminary design studies for new innovative systems. One specific class of systems is the so-called “dedicated waste transmuters”, that are fast neutron systems (critical or sub-critical, i.e. ADS), loaded with a Minor Actinide (MA) dominated fuel and potentially uranium-free. The availability of very general tools for sensitivity and uncertainty analysis together with new variance-covariance matrix data, produced in a joint effort under the auspices of the OECD-NEA by the world leading nuclear data evaluation groups, makes that endeavor particularly significant. In this report major results of interest for dedicated ADS are discussed and the most important fields and data types are pointed out, where priority improvements are required.
Date: October 1, 2007
Creator: Aliberti, G.; Palmiotti, G. & Salvatores, M.
Partner: UNT Libraries Government Documents Department
open access

Entropy of near-extremal black holes in AdS5

Description: We construct the microstates of near-extremal black holes in AdS_5 x S5 as gases of defects distributed in heavy BPS operators in the dual SU(N) Yang-Mills theory. These defects describe open strings on spherical D3-branes in the S5, and we show that they dominate the entropy by directly enumerating them and comparing the results with a partition sum calculation. We display new decoupling limits in which the field theory of the lightest open strings on the D-branes becomes dual to a near-horizon region of the black hole geometry. In the single-charge black hole we find evidence for an infrared duality between SU(N) Yang-Mills theories that exchanges the rank of the gauge group with an R-charge. In the two-charge case (where pairs of branes intersect on a line), the decoupled geometry includes an AdS_3 factor with a two-dimensional CFT dual. The degeneracy in this CFT accounts for the black hole entropy. In the three-charge case (where triples of branes intersect at a point), the decoupled geometry contains an AdS_2 factor. Below a certain critical mass, the two-charge system displays solutions with naked timelike singularities even though they do not violate a BPS bound. We suggest a string theoretic resolution of these singularities.
Date: July 24, 2007
Creator: Simon, Joan; Balasubramanian, Vijay; de Boer, Jan; Jejjala, Vishnu & Simon, Joan
Partner: UNT Libraries Government Documents Department

[Advertisement for "Celebrating the Centennial of Don Gillis" Concert]

Description: Segment by Dennis Fisher, conductor of the UNT Symphonic Band, announcing a concert featuring works by composer Don Gillis to celebrate his 100th birthday.
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: September 17, 2012
Duration: 1 minute 15 seconds
Creator: Fischer, Dennis W.
Partner: UNT Music Library

[Left Triptych Panel "iPod"]

Description: Photograph of a large "iPod" advertisement hung on the side of a building depicting the silhouette of a man wearing headphones. There is a parking lot in front of the building, with a sidewalk visible in the foreground. Buildings are visible on the background, on the left side of the image. This image is the leftmost panel of a set of three color photographs for a triptych titled "iPod."
Date: 2005
Creator: Williams, Byrd M. (Byrd Moore), IV, 1951-
Partner: UNT Libraries Special Collections

[Middle Triptych Panel "iPod"]

Description: Photograph of a large "iPod" advertisement hung on the side of a building. There is a parking lot in front of the building, with a sidewalk visible in the foreground. Part of the street and other buildings are visible on the background, on the right side of the image. This image is the center panel of a set of three color photographs for a triptych titled "iPod."
Date: 2005
Creator: Williams, Byrd M. (Byrd Moore), IV, 1951-
Partner: UNT Libraries Special Collections

[Concert Poster: May Day]

Description: Poster/flyer advertising a May Day Celebration concert featuring performances by the Good Luck Gentlemen, Febrifuge, RTB2, Christian! Teenaged Runaway, Tex Winters (Sarah Reddington), Jeremy Buller, Jamie Fisher, and Kati Trice, at J&J's Pizza.
Date: unknown
Partner: UNT Music Library

[Concert Poster: Backyard Block Party]

Description: Poster/flyer advertising a music festival with headliners Sailor Poon, Hikes, Whit, Dome Dwellers, and Sealion on May 16-18, 2017 at Backyard On Bell. Poster features artwork of a red-headed woman (visuals by Emily O'Connor) and lists all musical acts performing at the festival.
Date: 2017-05-16/2017-05-18
Partner: UNT Music Library

[Concert Poster: Cats & Dogs]

Description: Poster/flyer advertising a concert benefitting the Denton Humane Society featuring Greg Ginn & the Taylor Texas Corrugators, Shiny Around the Edges, Dust Congress, Brent Best, CS Flemmons, Dim Locator, Dear Human, RTB2, Holler Time, Spooky Folk, Video, Record Hop, New Science Projects, Delmore Pilcrow, and Sabra Laval on September 11, 2010, at Rubber Gloves Rehearsal Studio. {{{description}}}
Date: September 11, 2010
Partner: UNT Music Library
open access

[Clipping: The new ads]

Description: Photocopy of clipping from a newspaper. "The new ads" details the contents of the ads ran by Joe Barton as part of his senatorial campaign (duplicate of UNTA_AR0887-001-41-003).
Date: unknown
Partner: UNT Libraries Special Collections

[Concert Poster: Bob Moses]

Description: Poster advertising a concert by drummer Bob Moses with Stefan Karlsson and Fred Hamilton on February 7, at The Syndicate. Bob Moses is shown playing the drums.
Date: February 7, 2012
Creator: University of North Texas. College of Music. Division of Jazz Studies.
Partner: UNT Music Library

[Concert Poster: The Cookers]

Description: Poster advertising a concert by The Cookers and One O'Clock Lab Band on February 6, 2014, at Winspear Hall. The Cookers sit and stand on wooden pallets holding their instruments.
Date: February 6, 2014
Creator: University of North Texas. College of Music. Division of Jazz Studies.
Partner: UNT Music Library

[Concert Poster: Peter Erskine]

Description: Poster advertising a concert by Peter Erskine and One O'Clock Lab Band featuring UNT jazz faculty members on February 28, 2013, at Winspear Hall, Murchison Performing Arts Center. Peter Erskine is seated behind a snare drum holding drum brushes.
Date: February 28, 2013
Creator: University of North Texas. College of Music. Division of Jazz Studies.
Partner: UNT Music Library
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